Information about whales! ! ! ! !
There are more than 30 species in China waters. All kinds of whales live in the sea except a few whales that live in fresh water. The definition of whale itself is vague. Whales can include all cetaceans, as well as cetaceans of specific families.
Whales also include all dolphins. Whales are mainly divided into two types: mysterious whales and toothed whales. There are few species of baleen whales, but they are huge. At present, the smallest known species is more than 6 meters long, and the world's largest animal, the blue whale, also belongs to the baleen whale.
However, the shape of toothed whales is quite different, the smallest species is only about 30cm, and the largest sperm whale is more than 20m long. Whales do not belong to fish, but to mammals.
Extended data:
Overview of cetaceans
The existing species can be divided into baleen whales and toothed whales. The suborder baleen whales is huge, and the smallest species is more than 6 meters long. There are no teeth in the mouth. There are 150 ~ 400 horny baleen on both sides of the maxilla. The color, quantity and shape of baleen vary from species to species, which is an important basis for classification. 2 external nostrils, located on the top of the head. The head is particularly large, and some species can reach 1/3 of the body length.
Only 1 ~ 2 pairs of ribs are connected to the small sternum, and there is no clavicle. The flippers are generally 4 fingers. Have a cecum. They feed on krill and cephalopods, and some also live in eat small fish and benthic shellfish. There are 3 families 10 species, all of which are marine. Such as right whales, blue whales, gray whales, fin whales, humpback whales, great fin whales (minke whales) and minke whales (minke whales); Only a few species of toothed whales were born in fresh water, and most of them were born in the sea.
They come in all sizes. There are teeth in the mouth, only 1 external nostril. Flippers usually have five fingers. There is no cecum except puffer fish. It mainly feeds on squid, crustaceans and fish. It includes 7 families and more than 80 species. Such as baiji, sperm whale, narwhal, dolphin, Chinese white dolphin, finless porpoise and killer whale.
Baidu Encyclopedia-Cetaceans